Problematic tests list (4 rows):

bugs.gh_0310_test | System table with keywords
bugs.gh_6802_test | When the statement timeout is set, it causes the lock manager to delay reporting deadlocks until timeout is expired
bugs.gh_8061_test | Unnest IN/ANY/EXISTS subqueries and optimize them using semi-join algorithm
functional.metacache.core_4386_metacache_test | Error 'object in use' must NOT raise in 6.x with shared metacache (opposite outcome to prior versions).

This list is the same for:

5.0.4.1813 2026.04.20 d5e3647f | CS
5.0.4.1813 2026.04.20 d5e3647f | SS